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The Body Reset: How Women Should Eat & Exercise for Health, Fat Loss, & Energy | Dr. Stacy Sims

Order your copy of The Let Them Theory 👉 https://melrob.co/let-them-theory 👈 The #1 Best Selling Book of 2025 🔥 Discover how much power you truly have. It all begins with two simple words. Let Them. — Today's episode is a MUST listen. You will learn the surprising science of women’s exercise and nutrition, the mistakes you’re making, and the simple changes that lead to better health and longevity. For way too long, fitness and nutrition have been based on research done almost exclusively on men, and the women who have been following those strategies are left wondering why the fitness and nutrition guidelines don’t work for their bodies. That changes today. In this firecracker of an episode, Mel sits down with Dr. Stacy Sims, a world-renowned exercise physiologist and nutrition scientist, to break down exactly how you, as a woman, should be eating, training, and recovering for your hormones, metabolism, and overall health. Dr. Sims reveals why traditional fitness advice is failing women. She talks about how intermittent fasting drains your energy and why your workouts leave you exhausted instead of strong. She explains why fasted workouts, calorie restriction, and extreme cardio can actually make it harder to lose weight and what you should be doing instead to build muscle, burn fat, and feel amazing at every stage of life. Ever wonder why men seem to drop weight faster than you? Or why your workouts feel great one week and awful the next? There’s a reason for that. Dr. Sims will tell you, it’s all in your hormones. Inside this episode, you’ll learn: -Why women should NEVER train like men (and what to do instead) -The #1 mistake you’re making in the gym—and how to fix it -The truth about fasted workouts (spoiler: they might be wrecking your metabolism) -Why eating too little could be making you gain fat—not lose it -How to work with your cycle for better energy, results, and recovery -What every woman needs to know about perimenopause and menopause training If you’ve ever felt like your diet and workout plan isn’t working, this episode will change the way you approach fitness and nutrition forever. For more resources related to today’s episode, click here for the podcast episode page: https://www.melrobbins.com/podcasts/episode-275 Follow The Mel Robbins Podcast on Instagram: https://www.instagram.com/themelrobbinspodcast I’m just your friend. I am not a licensed therapist, and this podcast is NOT intended as a substitute for the advice of a physician, professional coach, psychotherapist, or other qualified professional. Got it? Good. I’ll see you in the next episode. In this episode: 00:00 Welcome 11:42 Common Fitness Mistakes Women Make 18:00 Why Women Should Be Lifting Weights 28:41 The Ideal Breakfast According to a Top Nutrition Scientist 36:13 Why Strong Women Stress Less 47:51 This Advice Helped Thousands of Women Get Stronger 51:17 The Exercise Routine Designed for Women 53:46 Getting Stronger Starts in the Kitchen, Not the Gym 01:08:39 Everything You Need to Know for Your First Time at the Gym 01:14:42 Cold Plunging & Sauna for Women: What You’re Doing Wrong 01:30:41 You Deserve to Feel Strong — Follow Mel: Instagram: https://www.instagram.com/melrobbins/ TikTok: http://tiktok.com/@melrobbins Facebook: https://www.facebook.com/melrobbins LinkedIn: https://www.linkedin.com/in/melrobbins Website: http://melrobbins.com​ — Sign up for Mel’s newsletter: https://melrob.co/sign-up-newsletter A note from Mel to you, twice a week, sharing simple, practical ways to build the life you want. — Subscribe to Mel’s channel here: https://www.youtube.com/melrobbins​?sub_confirmation=1 — Listen to The Mel Robbins Podcast 🎧 New episodes drop every Monday & Thursday! https://melrob.co/spotify https://melrob.co/applepodcasts https://melrob.co/amazonmusic — Looking for Mel’s books on Amazon? Find them here: The Let Them Theory: https://amzn.to/3IQ21Oe The Let Them Theory Audiobook: https://amzn.to/413SObp The High 5 Habit: https://amzn.to/3fMvfPQ The 5 Second Rule: https://amzn.to/4l54fah

Mel RobbinshostDr. Stacy Simsguest
Mar 27, 20251h 35mWatch on YouTube ↗

At a glance

WHAT IT’S REALLY ABOUT

Stop Training Like A Man: Dr. Stacy Sims’ Female Fitness Reset

  1. Mel Robbins interviews Dr. Stacy Sims, an exercise physiologist and women’s health researcher, about why most popular fitness and nutrition advice fails women. Sims explains her core principle, “women are not small men,” and details how female physiology, hormones, and muscle composition require different strategies from male-centered ‘bro science.’
  2. They dismantle common practices like fasted morning workouts and late-start intermittent fasting, showing how these actually increase stress, reduce muscle, and promote fat gain in women. Instead, Sims outlines a practical approach centered on eating earlier, prioritizing protein, lifting heavier weights with fewer reps, and using short sprint intervals for cardiovascular and metabolic health.
  3. The conversation also covers cold plunges vs. sauna for women, the mental health benefits of movement as stress resilience training, creatine supplementation, and how to build a sustainable, empowering exercise lifestyle rather than chasing thinness.

IDEAS WORTH REMEMBERING

5 ideas

Ditch fasted morning workouts; women need to eat before they move.

Women’s brains (especially the hypothalamus) are highly sensitive to low blood sugar after waking. Exercising on an empty stomach spikes cortisol, drives muscle breakdown, encourages fat storage (especially visceral belly fat), and leaves women feeling “tired but wired” rather than leaner or fitter.

Front-load your day with protein, especially in the morning.

Around 30 grams of protein soon after waking stabilizes cortisol, kick-starts metabolism, supports muscle maintenance, and improves sleep later by reducing nighttime blood-sugar crashes. Simple hacks like “protein coffee” or splitting breakfast into two small parts can make this realistic for busy women.

Shift from light, high-rep lifting to heavier, low-rep strength training after your mid-30s.

As estrogen and progesterone decline, women respond less to 10–12 rep, light-weight ‘toning’ style workouts. To maintain and build muscle, bone, and brain health, Sims recommends heavier loads for about 0–6 (up to 8) reps, with just 1–2 reps left “in reserve,” progressing gradually to avoid injury.

Use short sprint intervals instead of endless cardio to boost heart health and fat loss.

Women benefit from very short, all-out efforts (up to 30 seconds) followed by 1.5–2 minutes of full recovery, for no more than five total rounds. This “sprint interval training” triggers powerful changes in insulin sensitivity, fat utilization, blood vessel function, and body composition in a fraction of the time of long cardio sessions.

Intermittent fasting as popularly practiced usually backfires for women.

Holding a fast until noon while drinking only coffee keeps cortisol high, promotes muscle loss, encourages fat storage, and can harm bone and metabolic health. Women do better breaking their fast earlier (around or before 8 a.m.) and avoiding late-night eating, which delivers many of fasting’s metabolic benefits without the harm.

WORDS WORTH SAVING

5 quotes

“Women are not small men.”

— Dr. Stacy Sims

“If you get up and start your exercise without any food, the hypothalamus is like, ‘Wait a second, this is a stress to the body that I need to really try to figure out.’”

— Dr. Stacy Sims

“On the outside, that drive to be super thin is killing us on the inside.”

— Dr. Stacy Sims

“Exercise is an incredible positive stress on the body that creates changes from central nervous system down to the smallest little thing in your cell.”

— Dr Stacy Sims

“I want every woman to know that they have a right in every place, in every gym, every situation to be strong, empowered, and feel positive about the space that they’re in.”

— Dr. Stacy Sims

Why “women are not small men” in health, training, and researchFasted training, intermittent fasting, and morning nutrition for womenStrength training, muscle loss with age, and how women should liftHigh-intensity sprint intervals vs. long cardio for health and fat lossCold plunges vs. sauna: sex differences in heat and cold adaptationCreatine, protein intake, and practical nutrition for busy womenExercise as stress resilience and a path to body positivity and empowerment

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